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Three sanctioned tankers at Istanbul went quiet on AIS within twelve hours on 17 Sep. Great Jacombo (IMO 9319703) at 10:18 UTC and Fu Hai Wan (9368235) at 21:57 UTC, alongside each other at the same Tuzla berth. Lara (9221475) at 13:25 UTC at the anchorage off Yenikapı. None heard since.

When one ship goes quiet we can't tell if it stopped or our coverage did. So we count who else nearby kept transmitting: 15, 14 and 36 other ships through those three. In a repair yard that's often just the transponder switched off. What's alongside at Tuzla this week? hullcipher.com/vessel/9319703

Update on these. Great Jacombo came back at 4:08 AM EDT on 26 Sep on the same Tuzla berth, as FIANIT on a Russian number. None of her six lists uses that name or publishes a number for her. VesselFinder shows FIANIT as well. hullcipher.com/vessel/9319703

And a correction. The 15 and 14 were ships heard across that stretch of water, not at the berth. From 8 AM EDT on 28 Sep we heard at most four others an hour there, and none in half those hours. At 2 AM EDT on 29 Sep that jumped to 15. Both were back by 3:13 AM. So that was our coverage.